Advisory Details

September 14th, 2018

Microsoft Excel XLS File Use-After-Free Information Disclosure Vulnerability

CVE ID	CVE-2018-8429
CVSS SCORE	2.6, AV:N/AC:H/Au:N/C:P/I:N/A:N
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Office Excel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Office Excel. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of .xls files. Crafted data in an .xls file can cause a pointer to be reused after it has been freed. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process at medium integrity.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8429
DISCLOSURE TIMELINE	2018-06-19 - Vulnerability reported to vendor 2018-09-14 - Coordinated public release of advisory 2018-09-14 - Advisory Updated
CREDIT	Jaanus Kp Clarified Security

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